The family of Bassam Hamzy (pictured) have complained about his treatment within prison

The family of a notorious ISIS sympathiser say they have officially complained about the treatment he is receiving inside Australia's toughest prison.

Bassam Hamzy, 39, was unable to face the NSW District Court on Monday after being rundown by a combination of illness and injuries which he suffered in a recent jailhouse bust-up.

The founder of Sydney gang Brothers 4 Life was allegedly punched by a convicted terrorist inside the ultra-secure Goulburn Supermax about 11am on Sunday.

Hamzy's lawyer Zali Burrows told Daily Mail Australia his family suspects his illness - believed to have been food poisoning - may have come after he was deliberately targeted by someone within the walls of the maximum security prison.

Hamzy was struck down by illness at the weekend inside Goulburn Supermax prison (pictured) and his family believe 'his food may have been tampered with'

Ms Burrows said that despite the notoriety of the Islamic extremist, he still deserved to be treated humanely.

'Bassam's family are most concerned that his food may have been tampered with before or after the alleged brawl,' Ms Burrows said.

'Complaints have been made to the NSW Food Authority and to the Ombudsman for investigation.

'Questions arise as to what substance was fed to Bassam and how the assault occurred if (the prison) control who is in contact with him.'

Hamzy's prison altercation was revealed on Monday, when Ms Burrows was forced to step in and represent her client in court at the last minute.

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The convicted murderer had intended to represent himself in an appeal, but Ms Burrows - his legal representative in another matter - revealed to the court he was unable to appear because of the brawl and his health.

'It would appear he's been assaulted,' Ms Burrows told the court as she asked for an adjournment.

'He has a black eye, is currently in segregation and he's also got food poisoning.'

While Hamzy did not appear via video link he was supported in court by a number of relatives, including his father.

His alleged attacker was Talal Alameddine, 25, who is serving at least 13 years behind bars for supplying the gun used to murder police accountant Curtis Cheng in 2015.

Hamzy's lawyer Zali Burrows officially complained about his food poisoning to the NSW Food Authority (Pictured is a tuna and salad sandwich, which is widely available in all NSW Prisons)

Hamzy (left) was also allegedly assaulted by convicted terrorist Talal Alameddine (right), 25, at 11am on Sunday. Alameddine was jailed in May for supplying the gun used to kill Curtis Cheng

Hamzy's time at Goulburn prison (pictured) has been littered with headline making incidents, from alleged drug dealing to brawls with inmates

A spokeswoman for Corrective Services NSW confirmed an altercation occurred at 11am on Sunday.

'Two inmates, aged 25 and 39, were involved in an altercation at the High Risk Correctional Centre, in Goulburn,' the spokeswoman said.

'Staff immediately responded and separated the two men.

'Both inmates were placed in segregation while investigations continue.'

The incident came just hours after Hamzy was linked to the assassination of Sydney teenager Brayden Dillon.

The Daily Telegraph reported that Hamzy was suspected to have helped mastermind the killing of Dillon, then 15, as he slept in the bedroom of his mother's home.

Hamzy has not been charged in relation to the teenager's death but has links to three of the six people allegedly involved in the murder last April.

The murder, allegedly carried out by Conrad Craig, is believed to be a revenge attack for Brayden's older brother Joshua, 20, who allegedly stabbed Adam Abu-Mahmoud, 18, to death in a brawl.

Joshua Dillon pleaded not guilty to the murder.

Police believe Adam's uncle Abdul Abu-Mahmoud financed the hit on Brayden as an act of revenge.

The brawl came just hours after Hamzy (left) was revealed to have links to the 2017 murder of teenager Brayden Dillon (right). Police reportedly believe Hamzy helped mastermind the shooting

Hamzy's family have also questioned how he was assaulted when the prison closely monitors his interactions with prisoners. He is banned from seeing fellow 'Brothers 4 Life' member Farhad 'The Afghan' Qaumi (pictured)

Hamzy reportedly often socializes with terrorist Khaled Cheikho (pictured), who is spending 27 years in jail for his crimes

Hamzy's time in the country's strictest prison has been littered with headline-making incidents.

In 2008 he masterminded a methylamphetamine ring from inside prison, delivering more than a kilogram of the drug to Melbourne under the guise of a truck business.

Running the business through a phone hidden in his cell, Hamzy made 19,523 calls in just a matter of weeks.

That same year Hamzy used his smuggled phone to threaten a man who owed him $12,000.

'Now, I'm about to cut your ears off. I told you I'm going to compensate myself,' he told the man over the phone.

That same week Hamzy instructed an associate to threaten a different man.

'[Tell him] I'm gunna cut all his fingers off… next time I'll take his ears and make them into a necklace.'